I've had a friend similar to this before.

On the one hand I tried to be compassionate. On the other hand the term "suffocating" is a good one to describe such a friendship.

I needed to take care of myself, too. This was during my initial MS prognosis. She told off a friend of mine. Was a control tactic. She made the friendship about her. I had an MS prognosis, suddenly she had symptoms, too. She has used manipulation with her own family. Her own worst enemy. I had to walk away.